Ignoring your partner may make them to feel like you don't need them anymore, it makes the person feel like you are cheating or involved in bad things. It also makes the person feel very unappreciated, lonely and vulnerable by feeling that way it can cause them to stop missing you and gain strength to leave you. If you feel like you have been ignoring your partner do something to or with your partner that will show them that they still mean the world to you.
The small things count like saying I LOVE YOU or telling them I MISSED YOU when he/she comes home from whatever they were doing. Ask HOW ARE YOU TODAY? WHAT DO YOU WANT TO DO? Just simple questions that makes them feel appreciated, loved and cared for.